{"id":5772,"date":"2023-05-18T12:45:44","date_gmt":"2023-05-18T12:45:44","guid":{"rendered":"https:\/\/seadonna.com\/blog\/?p=5772"},"modified":"2023-06-02T17:27:46","modified_gmt":"2023-06-02T17:27:46","slug":"two-stroke-cycle-two-stroke-cycle-diagram-meo-class-4-marine-engineer-study-guide","status":"publish","type":"post","link":"https:\/\/seadonna.com\/blog\/two-stroke-cycle-two-stroke-cycle-diagram-meo-class-4-marine-engineer-study-guide\/","title":{"rendered":"TWO STROKE CYCLE | TWO STROKE CYCLE DIAGRAM | MEO CLASS 4 | MARINE ENGINEER STUDY GUIDE"},"content":{"rendered":"

Two-stroke cycle<\/strong><\/h3>\n

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\nThe two-stroke cycle is completed in two strokes of the piston or one revolution of the crankshaft.<\/p>\n

In order to operate this cycle where each event is accomplished in a very short time, the engine requires a number of special arrangements.<\/p>\n

First, the fresh air must be forced in under pressure. The incoming air is used to clean out or scavenge the exhaust gases and then to fill or charge the space with fresh air. Instead of valves holes, known as ‘ports’, are used which are opened and closed by the sides of the piston as it moves.
\nConsider the piston at the top of its stroke where fuel injection and combustion have just taken place . The piston is forced down on its working stroke until it uncovers the exhaust port .<\/p>\n

The burnt gases then begin to exhaust and the piston continues down until it opens the inlet or scavenge port.<\/p>\n

Pressurised air then enters and drives out the remaining exhaust gas. The piston, on its return stroke, closes the inlet and exhaust ports. The air is then compressed as the piston moves to the top of its stroke to complete the cycle.<\/p>\n

The opposed piston cycle of operations is a special case of the two-stroke cycle. Beginning at the moment of fuel injection, both pistons are forced apart one up, one down-by the expanding gases.<\/p>\n

The upper piston opens the exhaust ports as it reaches the end of its travel . The lower piston, a moment or two later, opens the scavenge ports to charge the cylinder with fresh air and remove the final traces of exhaust gas . Once the pistons reach their extreme points they both begin to move inward. This closes off the scavenge and exhaust ports for the compression stroke to take place prior to fuel injection and combustion . This cycle is used in the Doxford engine, which is no longer manufactured although many are still in operation.<\/p>\n

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Two-stroke cycle The two-stroke cycle is completed in two strokes of the piston or one revolution of the crankshaft. In order to operate this cycle where each event is accomplished in a very short time, the engine requires a number of special arrangements. First, the fresh air must be forced in under pressure. The incoming […]<\/p>\n","protected":false},"author":1,"featured_media":5774,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"class_list":["post-5772","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-marine-engineering-competency-exams-study-blogs"],"_links":{"self":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts\/5772","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/comments?post=5772"}],"version-history":[{"count":1,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts\/5772\/revisions"}],"predecessor-version":[{"id":5775,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts\/5772\/revisions\/5775"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/media\/5774"}],"wp:attachment":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/media?parent=5772"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/categories?post=5772"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/tags?post=5772"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}